109 lines
5.3 KiB
C++
Executable File
109 lines
5.3 KiB
C++
Executable File
/*----------------------------------------------------------------------*
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* Sleep demo for ATmega328P. *
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* Wire a button from digital pin 2 (INT0) to ground. *
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* Wire an LED with an appropriate dropping resistor from pin D13 to *
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* ground. *
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* Pushing the button wakes the MCU. *
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* After waking, the MCU flashes the LED, then waits 10 seconds before *
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* going back to sleep. *
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* *
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* Jack Christensen 07May2013 *
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* *
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* Tested with Arduino 1.0.5 and an Arduino Uno. *
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* Test conditions for all results below: *
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* 5V regulated power supply, fed to the Vin pin *
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* 16MHz system clock *
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* Fuse bytes (L/H/E): 0xFF / 0xDE / 0x05 *
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* Optiboot bootloader *
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* *
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* Uno R1 *
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* 38mA active, 26mA with MCU in power-down mode. *
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* *
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* Uno SMD edition *
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* 42mA active, 31mA power-down. *
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* *
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* Adafruit Boarduino *
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* Power select jumper set to "USB", USB (FTDI) not connected. *
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* 15mA active, 3mA power-down. *
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* *
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* Adafruit Boarduino without power LED *
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* 12mA active, 0.1µA power-down. *
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* *
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* Breadboarded ATmega328P-PU *
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* 12mA active, 0.1µA power-down. *
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* *
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* This work is licensed under the Creative Commons Attribution- *
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* ShareAlike 3.0 Unported License. To view a copy of this license, *
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* visit http://creativecommons.org/licenses/by-sa/3.0/ or send a *
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* letter to Creative Commons, 171 Second Street, Suite 300, *
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* San Francisco, California, 94105, USA. *
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*----------------------------------------------------------------------*/
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//#include <avr/sleep.h>
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#include <Narcoleptic.h>
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const int LED = 13; //LED on pin 13
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const unsigned long KEEP_RUNNING = 10000; //milliseconds
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void setup(void)
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{
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Serial.begin(9600);
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//to minimize power consumption while sleeping, output pins must not source
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//or sink any current. input pins must have a defined level; a good way to
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//ensure this is to enable the internal pullup resistors.
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for (byte i=0; i<20; i++) { //make all pins inputs with pullups enabled
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pinMode(i, INPUT_PULLUP);
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}
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pinMode(LED, OUTPUT); //make the led pin an output
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digitalWrite(LED, LOW); //drive it low so it doesn't source current
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}
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void loop(void)
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{
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Serial.println(analogRead(A0));
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for (byte i=0; i<5; i++) { //flash the LED
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digitalWrite(LED, HIGH);
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delay(100);
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digitalWrite(LED, LOW);
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delay(100);
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}
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//delay(KEEP_RUNNING); //opportunity to measure active supply current
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digitalWrite(LED, HIGH); //one blink before sleeping
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delay(100);
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digitalWrite(LED, LOW);
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goToSleep();
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}
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void goToSleep(void)
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{
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byte adcsra = ADCSRA; //save the ADC Control and Status Register A
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ADCSRA = 0; //disable the ADC
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delay(100);
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Serial.print("Disable");
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Serial.println(analogRead(A0)); delay(100);
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//EICRA = _BV(ISC01); //configure INT0 to trigger on falling edge
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//EIMSK = _BV(INT0); //enable INT0
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Narcoleptic.delay(3000);
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// set_sleep_mode(SLEEP_MODE_PWR_DOWN);
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// cli(); //stop interrupts to ensure the BOD timed sequence executes as required
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// sleep_enable();
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// //disable brown-out detection while sleeping (20-25µA)
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// uint8_t mcucr1 = MCUCR | _BV(BODS) | _BV(BODSE);
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// uint8_t mcucr2 = mcucr1 & ~_BV(BODSE);
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// MCUCR = mcucr1;
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// MCUCR = mcucr2;
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// //sleep_bod_disable(); //for AVR-GCC 4.3.3 and later, this is equivalent to the previous 4 lines of code
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// sei(); //ensure interrupts enabled so we can wake up again
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// sleep_cpu(); //go to sleep
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// sleep_disable(); //wake up here
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ADCSRA = adcsra; //restore ADCSRA
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}
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//external interrupt 0 wakes the MCU
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ISR(INT0_vect)
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{
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EIMSK = 0; //disable external interrupts (only need one to wake up)
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}
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